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    <title>Flight Animation</title>
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          <h4 id="title">Flight Animation</h4>
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          <p id="shortdesc">Demonstrates how to animate flights with ´postcompose´.</p>
          <div id="docs"><p>This example shows how to use <b>postcompose</b> and <b>vectorContext</b> to animate flights. A great circle arc between two airports is calculated using <a href="https://github.com/springmeyer/arc.js">arc.js</a> and then the flight paths are animated with <b>postcompose</b>. The flight data is provided by <a href="http://openflights.org/data.html">OpenFlights</a> (a simplified data set from the <a href="https://www.mapbox.com/mapbox.js/example/v1.0.0/animating-flight-paths/"> Mapbox.js documentation</a> is used).</p>
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          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.geom.LineString.html" title="API documentation for ol.geom.LineString">ol.geom.LineString</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.Stamen.html" title="API documentation for ol.source.Stamen">ol.source.Stamen</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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          <textarea class="hidden" name="title">Flight Animation</textarea>
          <textarea class="hidden" name="description">Demonstrates how to animate flights with ´postcompose´.</textarea>
          <textarea class="hidden" name="js">var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.Stamen({
        layer: &#x27;toner&#x27;
      })
    })
  ],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

var style &#x3D; new ol.style.Style({
  stroke: new ol.style.Stroke({
    color: &#x27;#EAE911&#x27;,
    width: 2
  })
});

var flightsSource;
var addLater &#x3D; function(feature, timeout) {
  window.setTimeout(function() {
    feature.set(&#x27;start&#x27;, new Date().getTime());
    flightsSource.addFeature(feature);
  }, timeout);
};

var pointsPerMs &#x3D; 0.1;
var animateFlights &#x3D; function(event) {
  var vectorContext &#x3D; event.vectorContext;
  var frameState &#x3D; event.frameState;
  vectorContext.setStyle(style);

  var features &#x3D; flightsSource.getFeatures();
  for (var i &#x3D; 0; i &lt; features.length; i++) {
    var feature &#x3D; features[i];
    if (!feature.get(&#x27;finished&#x27;)) {
      // only draw the lines for which the animation has not finished yet
      var coords &#x3D; feature.getGeometry().getCoordinates();
      var elapsedTime &#x3D; frameState.time - feature.get(&#x27;start&#x27;);
      var elapsedPoints &#x3D; elapsedTime * pointsPerMs;

      if (elapsedPoints &gt;&#x3D; coords.length) {
        feature.set(&#x27;finished&#x27;, true);
      }

      var maxIndex &#x3D; Math.min(elapsedPoints, coords.length);
      var currentLine &#x3D; new ol.geom.LineString(coords.slice(0, maxIndex));

      // directly draw the line with the vector context
      vectorContext.drawGeometry(currentLine);
    }
  }
  // tell OpenLayers to continue the animation
  map.render();
};

flightsSource &#x3D; new ol.source.Vector({
  wrapX: false,
  attributions: &#x27;Flight data by &#x27; +
        &#x27;&lt;a href&#x3D;&quot;http://openflights.org/data.html&quot;&gt;OpenFlights&lt;/a&gt;,&#x27;,
  loader: function() {
    var url &#x3D; &#x27;https://openlayers.org/en/v4.6.5/examples/data/openflights/flights.json&#x27;;
    fetch(url).then(function(response) {
      return response.json();
    }).then(function(json) {
      var flightsData &#x3D; json.flights;
      for (var i &#x3D; 0; i &lt; flightsData.length; i++) {
        var flight &#x3D; flightsData[i];
        var from &#x3D; flight[0];
        var to &#x3D; flight[1];

        // create an arc circle between the two locations
        var arcGenerator &#x3D; new arc.GreatCircle(
            {x: from[1], y: from[0]},
            {x: to[1], y: to[0]});

        var arcLine &#x3D; arcGenerator.Arc(100, {offset: 10});
        if (arcLine.geometries.length &#x3D;&#x3D;&#x3D; 1) {
          var line &#x3D; new ol.geom.LineString(arcLine.geometries[0].coords);
          line.transform(ol.proj.get(&#x27;EPSG:4326&#x27;), ol.proj.get(&#x27;EPSG:3857&#x27;));

          var feature &#x3D; new ol.Feature({
            geometry: line,
            finished: false
          });
          // add the feature with a delay so that the animation
          // for all features does not start at the same time
          addLater(feature, i * 50);
        }
      }
      map.on(&#x27;postcompose&#x27;, animateFlights);
    });
  }
});

var flightsLayer &#x3D; new ol.layer.Vector({
  source: flightsSource,
  style: function(feature) {
    // if the animation is still active for a feature, do not
    // render the feature with the layer style
    if (feature.get(&#x27;finished&#x27;)) {
      return style;
    } else {
      return null;
    }
  }
});
map.addLayer(flightsLayer);
</textarea>
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</textarea>
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        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Flight Animation&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://api.mapbox.com/mapbox.js/plugins/arc.js/v0.1.0/arc.js&quot;&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;script&gt;
      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.Stamen({
              layer: &#x27;toner&#x27;
            })
          })
        ],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [0, 0],
          zoom: 2
        })
      });

      var style &#x3D; new ol.style.Style({
        stroke: new ol.style.Stroke({
          color: &#x27;#EAE911&#x27;,
          width: 2
        })
      });

      var flightsSource;
      var addLater &#x3D; function(feature, timeout) {
        window.setTimeout(function() {
          feature.set(&#x27;start&#x27;, new Date().getTime());
          flightsSource.addFeature(feature);
        }, timeout);
      };

      var pointsPerMs &#x3D; 0.1;
      var animateFlights &#x3D; function(event) {
        var vectorContext &#x3D; event.vectorContext;
        var frameState &#x3D; event.frameState;
        vectorContext.setStyle(style);

        var features &#x3D; flightsSource.getFeatures();
        for (var i &#x3D; 0; i &lt; features.length; i++) {
          var feature &#x3D; features[i];
          if (!feature.get(&#x27;finished&#x27;)) {
            // only draw the lines for which the animation has not finished yet
            var coords &#x3D; feature.getGeometry().getCoordinates();
            var elapsedTime &#x3D; frameState.time - feature.get(&#x27;start&#x27;);
            var elapsedPoints &#x3D; elapsedTime * pointsPerMs;

            if (elapsedPoints &gt;&#x3D; coords.length) {
              feature.set(&#x27;finished&#x27;, true);
            }

            var maxIndex &#x3D; Math.min(elapsedPoints, coords.length);
            var currentLine &#x3D; new ol.geom.LineString(coords.slice(0, maxIndex));

            // directly draw the line with the vector context
            vectorContext.drawGeometry(currentLine);
          }
        }
        // tell OpenLayers to continue the animation
        map.render();
      };

      flightsSource &#x3D; new ol.source.Vector({
        wrapX: false,
        attributions: &#x27;Flight data by &#x27; +
              &#x27;&lt;a href&#x3D;&quot;http://openflights.org/data.html&quot;&gt;OpenFlights&lt;/a&gt;,&#x27;,
        loader: function() {
          var url &#x3D; &#x27;https://openlayers.org/en/v4.6.5/examples/data/openflights/flights.json&#x27;;
          fetch(url).then(function(response) {
            return response.json();
          }).then(function(json) {
            var flightsData &#x3D; json.flights;
            for (var i &#x3D; 0; i &lt; flightsData.length; i++) {
              var flight &#x3D; flightsData[i];
              var from &#x3D; flight[0];
              var to &#x3D; flight[1];

              // create an arc circle between the two locations
              var arcGenerator &#x3D; new arc.GreatCircle(
                  {x: from[1], y: from[0]},
                  {x: to[1], y: to[0]});

              var arcLine &#x3D; arcGenerator.Arc(100, {offset: 10});
              if (arcLine.geometries.length &#x3D;&#x3D;&#x3D; 1) {
                var line &#x3D; new ol.geom.LineString(arcLine.geometries[0].coords);
                line.transform(ol.proj.get(&#x27;EPSG:4326&#x27;), ol.proj.get(&#x27;EPSG:3857&#x27;));

                var feature &#x3D; new ol.Feature({
                  geometry: line,
                  finished: false
                });
                // add the feature with a delay so that the animation
                // for all features does not start at the same time
                addLater(feature, i * 50);
              }
            }
            map.on(&#x27;postcompose&#x27;, animateFlights);
          });
        }
      });

      var flightsLayer &#x3D; new ol.layer.Vector({
        source: flightsSource,
        style: function(feature) {
          // if the animation is still active for a feature, do not
          // render the feature with the layer style
          if (feature.get(&#x27;finished&#x27;)) {
            return style;
          } else {
            return null;
          }
        }
      });
      map.addLayer(flightsLayer);
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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